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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '129f0e48cd639cc4446062d85d789fc4e0ccf818c2cc95d16f1147aecf607e39' 
  AND token = 'LIB9OToRR6ghZ5yJDG+tCIoC5MozM780XGonb1Hb/+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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