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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d77cf39f648d13d5c2eb8e96d3338a20acd143956e1567ebd4d825f516613dd' 
  AND token = 'ux2jI4w9umGX68wWGSLqo+HXOlOY8qG6T4ptb7z77cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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