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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '69ef92006720523ee86c4c1cc0214916e9ca59434baf46effa34ebf128dfbfee' 
  AND token = 'AY9Fmxvo4Vq9s8ETzG1amD6aeBBz7zbYHeNRHKE7Vks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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