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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2c368c54687c17ab10420ae7c7b8a72fd756ff59cbc0d0fe4a287e5175806497' 
  AND token = 'aZdTLOOL7XMEuM7MqG8udKLDd7hua/uWo07Izfh2fyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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