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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '920db8e86117ddc42005ab5a08102aa7e22533ec553110ad17262319e3a7f327' 
  AND token = 'MbuYvEA9fKb7MQCMRWho0mX7u0TDis+13w25y1ygzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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