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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a06cbcb6046c176d614d54c2468cd9230f09e81f65d220eb42f0ae16d5e0275e' 
  AND token = 'F8FV/vlffFcArbZNn8MCZ++Jua05kv6tAfsdLPcw4sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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