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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bf9e33fd86e0045c503c7171fa8524c740eaf39a2f1542e79726b89450a034e1' 
  AND token = 'btdi3c9EOgvwjvKFou+r+Lp3jsjGIk0d67IsabArOpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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