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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e2507b25b391ef71679b24560d814fa61691f844b2daa8e7f7af19deea69f85' 
  AND token = 'xuONt21PPJxY23/mPdB1VbENJmeHP6toXkHCBwNCiOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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