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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02dc344384e7762e0f3ae421adc63e3f8e3f6fdb2721a133eef683efada09b99' 
  AND token = 'uDfzZo9v6+5p4q3wLIvpF2CHlHsl53oTv2yXuMz9L88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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