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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d20f4df97f956515a811174f30bd1d8d89cf9d18f9fa36847e98370e47c5727' 
  AND token = 'QnfxFvTG7nQpdF/PHAnPK84Wy72J92j1b9OTT803v/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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