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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd1a8cdff6191fcf406d5a8009d3c27a50b2490d400f533d98a6e63a6cd9c2a1' 
  AND token = '7IgCp71Lyar9zhQRDvStIbQj0obeebK2/7LaDE0yOig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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