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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee399b0b200a45ef0e21b1e1383b7fe2e73b8033c17b0c633307a0b4e1b8fb06' 
  AND token = 'NxSjBkt1n6xBYx3cVewPxLdVuTc4SVb/O/M14TZnQR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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