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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c34f18d872559c4ca352d0755a13042743a4f19aa69a26b6b1c6e4ff62e68de4' 
  AND token = 'yG4A7iSWyCgG3eLtpxPql/RiRrdQzEr1zbUWTHUpsNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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