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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb9cd3ab5853638fb3c0e65eb30b3a8f779e00bec5fe20090da38d40534d6dd5' 
  AND token = 'xdlHZp8HZQFMzW9pKOq6d9HEBgmqrkr4kwl3n1Lu4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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