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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '36087061f014d32a7feae6817f6c4ed9ea47c2a32fd5561d22c8ca41c228fa02' 
  AND token = 'ZnQr1sH3Yw7HpVtpPM7eCzQs0b2qsGsDuO2ZvQoxLV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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