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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '783107935e9e9532edc90ced173c4f72d620c45e9a4801e47a81c2fa3524bf40' 
  AND token = 'ym7AHGR7bj8hmXXAI7w/rP+8VuXeDtB07lNjo5RgjVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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