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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd63bdb6c6f313bf9f4485e52af1f155cd0f185a4643566281c27eba21fb10c70' 
  AND token = 'mJubqwyYnHlkPuHwrBJNr0GI/56Q6XOED8A3TFrHut0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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