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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f766d2c850d606c4e5e36f3c5f9f9018bca136d1f5511524a0a57eabe4f47d23' 
  AND token = 'NQZPRnidf4XsHQ4SduHqPx5iUBiwqPQuFv3lgNAfv6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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