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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7831c261376314cc6e508542765832ffec4681b7d1eb371a4ad64fd88b31d44e' 
  AND token = 'x/WDD2qB4D6rYOhhATfdWoZX6SchdX13ue6ms381lp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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