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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4b5beb17ce8bfafd562c078f592b53362665ef9eba5877c652ea622ef08ae351' 
  AND token = 'uxYrR0U2w3jHKxPu7zbtApgNZPJQlqeKTw3e/NmWfl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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