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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b4e513b0143e0bf04f83d05ca6b2f7f403fb53a8bb36606e19bfc20bb8f01a04' 
  AND token = 'GEN/4eNcgrN8xklfbT0ipGyh52sSy/cJ5bLzSe5Nugs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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