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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '14812c2a35dfc03a1d7d3be800e20dc5535ee7bbdff731a83a4f6db1c9bb1bac' 
  AND token = '645IQWj3zuwshcuwrVDdO2a7KaXjlm9uNmC3y+n9bi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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