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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39380797f16d93340ea84a2b140db3b3f640b8b60e550405a90b3e47e3c18fd7' 
  AND token = 'sx65dtM78G1w6GGacOgJi73saWz4f+Q5HrTlCzt0i80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}