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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a638693d7bcbda8b4b87cef8ffbb329c68227b5ddafcf83bff1492868c70df8b' 
  AND token = 'o49mRfca2jr8HOOnLfoUaWu/KdohwRRbdxJdf/S1rgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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