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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'abeb8dfc9b38f01137b8403ce94ed2e7a644cffed4e3c33c93ac235e63a9bf52' 
  AND token = 'rPesgmGs4NEKv+FJcybTxO2R9rNV5JQUfRtxgMX2N9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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