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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '710c7179ee19414196f2c93e33f26cd813dd5cfe2ca36419e26f142809a161ac' 
  AND token = 'deG/oF0YyL1ZitZmqjXp29XlJ6J+fn8OpW3Ud8Bhd9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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