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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2fd20a69af56785e3093a8b56a1b44292655e217681b97de5eff0cbefc5298ab' 
  AND token = '/i/+IRYC1od4DOwkheayfPYa8Hz78VCC1r0OL3Jasyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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