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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '881cb019c4debc27c98bfa38b7befb275ceb70809f15892ce31dc9b53a8fe23a' 
  AND token = '7djeQWGskuoNwfGHFD2x0t3eBNTrz1Y172nrUlxG/pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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