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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'afcf2ae49602f61ebeb64b1c6244ae4b57b145c5c5e83d1e084b9d718b1522b3' 
  AND token = 'WJCt1Bp9eeFqG9ZjHx4Y1j0NO/vefcLsqL9okH6w3Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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