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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '694edc2e4b005918e8b1293fe3a8ccf74bec58d23e60c9cc9d2f49e52448469a' 
  AND token = 'ZZq+wVQYGTR3taxm/tGck2T+jvcK278qTinHYTcSs/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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