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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab1c53061242a9a59a2a413413a979affe9dee0c655261c56d60687e1dd0c731' 
  AND token = 'CKd7wzjSmjpWb8kB5T1zrflIqkXNBjkL0ZeKj3oMrhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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