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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5962ac3db818fa5bd0ca3068e4da15e790d43f4f0cda063cf3e5217e5aa63001' 
  AND token = 'rh4mz386nl9c4Wgw1AXd9Hx0QhTNVC/x+ogz6HXLsw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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