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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '198cfcab83c0a0ff4b90fffbf6a62490ba93fbe1da7d7fe51a8f6f7d5a63ee82' 
  AND token = 'Bj2Kf8GPq6IcAaPJt5eVRt9XSmH5XKWJAMZZySDzHc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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