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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9537ac90ba34f27a7aef6431657cc25f0eadaa57fc55d21063f74d4587f0f7a' 
  AND token = 'qlvu3dqvz2Emwu/1D4TsnRFLf9gwxcxtNQEDAWfwIvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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