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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4d9f26d6eb3f7a4f2d20e9e2a60cc70e2979a612aec02ead89a1b4ac8f76573' 
  AND token = 'GS9T75EhBB7VafQgOWYdxCK/FdvV3eVRJk7VP2FuY6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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