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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4e8a7a324dabde8e2b8f0e520e65a253bdd7b4f92f41842d214c000e6ece341' 
  AND token = 'iNDavW07m+ExjdYia3HTFjAV6HGb6Qql77bQSaGotos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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