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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '391f64589e1f4d2e48771f2b41230fd1524b3e18af0f02097087b22ab63cb01e' 
  AND token = 'g3rKy40VM8oEpvhpu0a2M6ZfxOfn6IOOOI1EIpkhjbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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