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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9cb4d2a36c5b99e0a0711bd6c2b806cccb1ab7cbed907237ea7caed969529f86' 
  AND token = '1v3StCR29tXvqtzIOuO9786ZnZMn3icdwsJBT4kE3VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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