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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a531d290d06c624634d8901ce7edcc7278c3ab6e943af333f2450cf6d74884c' 
  AND token = 'Ruomo2fJufZIiteEE6YJ/OLwhaTk1lc50f28hvaGXlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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