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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a9e311abaa236bce8518a18ab0cd8c313f5bfde37d8281982885e3fd6fe8a2e' 
  AND token = 'z2mNGOvG07Ct7D62pqTVWlt6OdC2lLtm8uR7SxRsLaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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