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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '50ac7b3f5ffaf96d8bcf9aa3b1d44e79660a58d0b21cc32f1a7f689e8430f974' 
  AND token = 'NQPxgtjykaIaPcfHEOyG92hrFxDsyAH68D3BDrulYpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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