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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05667ec4cd2d44a4d3a378dcfb0ec7e07a698af5cf59dbce12afb627fcda90a1' 
  AND token = 'cG8uX62OrROc/bCOZVThW/Uqsz5F754Z5lqecaUoxp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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