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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1f36ea5cc3ac683d33010ae567cafcf62bd91cd115fdbdfc113e2bdfa45f6df6' 
  AND token = 'j56Gu3XZSCkCf4vkTx+yO+8vs2HjzfWwm3Cz51mRKZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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