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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93f9ca8044e7c3865104d119a73fa068c943d6167c26023bb547909ea421538b' 
  AND token = '8L/+gasDmRU7tAa7QLk/pOrArc5U6U/FWIBCcdbW77s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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