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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0f8f22132a376e4b28dc9619420aaca5d03db3eb201177b03ab911b21c1846d' 
  AND token = 'qH3Wi8fNOUnG7iCHVda/kKvoJPi2FFrM4AnPrztIdKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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