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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a217d01429ea8ff01e3f7b9839979dc48a77306361e890513cf0427cfa8d2a92' 
  AND token = '7kzhnv5RuJ3fdpaWjdVDIN7Os+1EA3TXuGyyeoA1KHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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