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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '642a9878d11314b9e72ec7d142d2c654d4b001d739d674127682206af82f66a1' 
  AND token = 'RSn6VHVJJ9ic6UDL/0JkVIgvghbuNw1TnnAOpfeDx1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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