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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5d3a84028769023b1632f8fa426c0e6d6709fa921b4cb0ec6557a06dbfa46fe' 
  AND token = 'DxzBrdzOjO9jjMSQbdNtHv5ghhkB/sGdAr7b/Dans54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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