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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d575db5d7ab0ebaf73289b6d7152c85adb2a10edfbc9d6696687c6116453ec6' 
  AND token = '/v7DHyqE/6EOwW98+up7GrfQ273q9VVAe8UHo+/Bqok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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