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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc8abf075e80da1c4f4ebfa5eefbd79d9d942f9de9c69a1bf3a74cfdc6f12aa7' 
  AND token = '/vin3gVPxWwG0DBw4lekI/IeTPELPoooXfgpYWlWD+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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