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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe951c7ebf34b85233b05dcf6ac917c70d11f3f21a95f926fef1666621d4ed85' 
  AND token = 'J1KJgwk/kzf2KvHStt8rJImxkMphVgW/KetPrckri8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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