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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '983aeeb30390ddeb40625937355380e385a69110c1b63bbb01d387e8fb751c83' 
  AND token = 'D2DMEBS8UosCGuYjwdNQIekjf0oaoXSYN3yEmfkoHYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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