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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd88511a1cee706750f6616852ea9fdf3a0e1e3683984a29d80e6b4da33e3350' 
  AND token = '78qYBmcYxmyf8HUiHMFqjWe/xl/HV1pOYFiX3KSHGHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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