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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '596679311caaadf718bbca215bdc0fb76887364f2293b0e0d6f644c8cfd7699d' 
  AND token = 'yZ8xVhfxEqRX2a917nl+Lh/uCAAV2a8NqUYsbJ50OxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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