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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab60932d8437134b8610bbc4e2c1918101a54d0fb09796d53544c7e5eac3a696' 
  AND token = 'bTBIiplOOaEaz54CgwbsodHbnCWvEFbJOBahvhWPHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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