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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '785ddda771c97476c3c327d50d10be8f3aa80c7ac1120bf7d0b7543db733ca16' 
  AND token = 'MW5WOZm9BFXbMVUgYfuWzxxebsoeTsjoYNeoa5JP0pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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