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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a090ef37033efb1a8797569aec666fb39a15eb2de573dcba0c320ae3e291de2' 
  AND token = '8yTy70J41OklwW0EgH3K7XuExj7nUhKEIj6LY8+D+DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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