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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9cc33ff26627fb1a9a75beaf746a248d7ff809f7ea5733cb80cbddb94f17e4b' 
  AND token = 'gDwNsippED+Jd7pcZaQMb8t8el8wCbJwpr/Qe2YKKv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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