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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '382aac62c6729752d251529da72ee0869b8778157ee17b64be5b957b3449f609' 
  AND token = '3sbcTUBrfvTAfpkMxlHcF/MIO6ioy97/iLpQ1Uht6OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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