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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb83632d7bb28e95c8094541554cb9f38bb87bd00da7e3729aa17eb40dd6da09' 
  AND token = 'CrlFuNa3c50iyjQCrCVGraDF2SaYL4CIGXj16Var5Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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