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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '542620459b3746210f913582a0ba563e79ad457ba0cf3300e1a1d8f1f8411899' 
  AND token = 'n8UAEz9HfWrC+tcELYin8Fas0sJuziRFISLnLH6nX9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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