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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b13f6a23ed20b6c4e636fcc1a83ff1e9e7dbc16c95027cc0e3f6a64e0b6da676' 
  AND token = 'pTYI3kXO911dQEXaK3oYJwaezWngdiyNGayVba244UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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