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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58c4afc9ea29f83aebcd3ef37a66593271449ddd20cfc81a71e91a7e39150546' 
  AND token = 'udjOZr/bl9Dl+o5Psz5zz2cJgpyLCcTtftS6Ih+j730=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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