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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb86392e495adef7ebdbb4c43f451696d43aac2ea2a8e711572054adedc004a1' 
  AND token = 'EcQt1AdTV0ih/l88kxqplLQ0aIW3YNMgIQD4/CapjeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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