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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff06b7414e4919fad6f2d19533e9e37f6a5e3e5bb9693c29aedc15e65c76e602' 
  AND token = 'S4qd3s/yIeoycxt1Hc6kLqoXfoJmNhN97MB9cqVRIyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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