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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29f196671f6e5dd083619cd7729607d67dc19f23c771521af93b8c6e7cc90457' 
  AND token = 'LNi48E9nr6OKy4P5cklRfgOaFMuq6/oeJEM+PzHtNz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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