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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'baa2fa0f5d13dd76cc63bed5a6528ff9e3e6df40187c45c14540489fc43d7c43' 
  AND token = '/nDiFEavMSA5ZNj83yigGVnsm7a+T8cmqIzRUiTL5as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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