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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d15acc83a4caf13ca10e444e585629765b62474df7495c97a2a1a24e030bba9' 
  AND token = '+gGPp/b2XKp2mOm4h2dgZgAdE1r8cBfySs4y4bO9PBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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