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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bdedd2cf373ee85e231402640011f4ec03ca30d12eb85cba30a525c501ede3ed' 
  AND token = 'T/QGlynzFTHk67c+kbFSyUFo99uHmCV+TP0KJWyDCUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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