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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b03a480b00a7059f3d1047e8adb30dcbe8aeb878677b29c257b25e490935ce34' 
  AND token = '54MvDnvZiHb+D0a+aT5JKZj+JHnzyPbvzsHxYtnk4KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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