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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd5e358985d10b1bac04330131fb1ebfe0e3dec46ac6d877eb5c2cf7595732d62' 
  AND token = '9tswtu6jAfdYrmfK94+Ix8hY2egGxoZR0jw+oy8DBkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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